This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A047108 #4 Mar 30 2012 18:56:53 %S A047108 1,4,15,57,215,812,3083,11750,44934,172401,663370,2559008,9894006, %T A047108 38331115,148770379,578346672,2251636041,8777816518,34261079538, %U A047108 133873978089,523638632149,2050085911219,8033148700174,31502487793694 %N A047108 T(n,n+3), array T as in A047100. %K A047108 nonn %O A047108 0,2 %A A047108 _Clark Kimberling_